ruby under microscope

Ruby on Rails (also known as rails) is a ruby framework for Internet applications that support databases. I've now used Rails for two different applications and involved two other associated programs. For the upcoming new book Java to Ruby (see Resources), I've interviewed a lot of Rails developers (those who have succeeded and failed on that framework), the foun

What is an accessor?We've discussed the real variables before, but not too much discussion. The real variable of an object belongs to its property and is a general difference from other objects from the same class. It is important to read and write its properties; This requires a property accessor (attribute accessors) Approach. We will soon see that we do not always have to explicitly write accessor methods, but let us now understand all the details. The two types of accessors are write (writer

Go to Script/consle after upgrading Ruby and Rails: Copy Code code as follows: /usr/local/lib/ruby/1.8/irb/completion.rb:10:in ' require ': No such file to load-ReadLine (Loaderror) From/usr/local/lib/ruby/1.8/irb/completion.rb:10 From/usr/local/lib/ruby/1.8/irb/init.rb:252:in ' require ' From/usr/local/l

Ruby offers a conditional structure, which is common in modern programming languages. Here, we'll explain all of Ruby's conditional statements and modifiersRuby If...else Statement:Syntax: If conditional [then] code ... [elsif conditional [then] code ...] ... [Else code ...] End An if expression is used for conditional execution. The value false and nil are false, and the rest are true. Note that

Enter the interactive interpreterpythonIrb/prySet Encoding#coding =utf-8#coding: Utf-8Package ManagementEasy_install/pip GemPip Install MarkdownGem Install MarkdownNotesPython line Comment # startsPython Multiline comments use three single quotation marks ("') or three single quotation marks (" ").‘‘‘Multi-line Comment 1Multi-line Comment 2‘‘‘Ruby Line comment starts with #Ruby Multi-line annotations use =b

Let's write a function to calculate the factorial. The mathematical definition of the factorial is as follows:N! = 1 (when n = 0)= N * (n-1 )! (Other Cases)In Ruby, you can write as follows:Copy codeThe Code is as follows:Def fact (n)If n = 01ElseN * fact (n-1)EndEndYou may find that end appears repeatedly. Because of this, Ruby is called the "Algol" language. (In fact,

The ruby language has existed for a long time and has never been popular in China. Many people only know such a language and there are few people. No matter what language has been developing for more than a decade, it must have something unusual. It cannot be better or worse than the NLP language itself. However, it is time and demand to become a popular language. Just like Ajax technology, to be honest, it is really an old technology that has been ap

ArticleDirectory Ruby source code Windows Linux Here, you can download the latest Ruby version suitable for you. The current stable version is 1.8.6. Read the ruby open source license before downloading it. Ruby Source code If you want to make it more compatible with your platform or you ne

Ruby on Rails ...... It has nothing to do with. net ...... The homepage is for more people to access Ruby on Rails ...... Withdraw tomorrow ...... Http://www.blogwind.com/Wuvist/16993.shtml By the way, I use Mac, and the cute editor used in blog Park has become a text area in safari. However, the latest version of cute editor is already compatible with safari to some extent ...... After reading the video o

This article uses a simple example to illustrate how to write a ruby script to perform Oracle database operations. The main steps are as follows: 1. Download Ruby at the following address: Http://www.ruby-lang.org/zh_CN/downloads/Here we download the ruby Windows version:Click: Ruby 1.8.6 step installation connecti

A series of questions elicited by Easyios: the previous Cocoapods installation and use tutorial in the reprint explains why you should use Cocoapods, but to install cocoapods requires a ruby environment, Installing the ruby environment first requires the installation of Xcode (because of the Xcode development tool, he helps us install the development packages needed for the UNIX environment) and then needs

Ruby You don't need to talk about this. RVM It is used to help you install the Ruby environment, help you manage multiple Ruby environments, and help you manage the Ruby environment on which the Ruby application you develop uses the machine. The

Ruby is a fully object-oriented interpreted scripting language. For such a new programming language, its features are very attractive to programmers. Let's take a look at the concepts related to Ruby threads. How to call win32ole IN Ruby Ruby basic code Experience Sharing Summary of several common

Php-python-rubyOriginalA word summaryTo summarize briefly:If you want to help him find a job as soon as possible, make money, recommend PHP.If you want him to be an efficient engineer, recommend Python.If you want to make him fall in love with his job, Ruby is recommended.Choice of languageProgramming languages are very important, don't think they are all Turing equivalents, and use them all the same. In fact, the good language, the thing that brings

This article mainly introduces the introduction of CGI programming with Ruby Guide, writing CGI script is also ruby for network programming, a basic function, the need for friends can refer to the To write a CGI script: The most basic ruby CGI script looks like this: ? 1 2 3 4 5 #!/usr/bin/ruby puts

In this chapter we will discuss more Ruby process control. Case We use case statements to test for ordered conditions. As we have seen, this is quite close to the switch of C,java, but more powerful. Ruby> i=8 ruby> case I | When 1, 2..5 | Print "1..5\n" | When 6..10 | Print "6..10\n" | End 6..10 Nil 2..5 represents a range between 2 and 5. The following exp

Web applications are mostly IO-intensive, and using Ruby's multi-process + multithreaded model will greatly increase system throughput. The reason for this is that when a ruby thread is in the IO block state, other threads can continue to execute. But because of Ruby GIL (Global interpreter Lock), MRI Ruby does not really use multithreading for parallel computing

-get Install bag Name The software installation timed out for a variety of reasons at home. You are in the bottom of the installation process, if there is a positive rejection of the server, 80% of the possible line is by the wall. Or be your company, home network screen off or appear a slow, half a day does not move phenomenon, congratulations, you have to change the source address. RVM Workaround: After installing RVM, make sure that RVM-V can perform the following command to replace se

Relevance Consulting's Stuart Halloway recently wrote a series of blog posts about the "Ruby vs. Java Geek talk". The inspiration for this series comes from his recent experience with a zero-start, previously constrained Ruby project that has been reversed to a full-fledged Java project. In the course of the project which lasted many days, Halloway explored the following "Mistaken ideas": 　　One of the myths

When it comes to Ruby, it's just a reflex to think of rails, which seems to have only one use for Ruby, rails. Although I didn't write rails, I thought the Ruby language itself was far more attractive than the third-party framework of rails. It is a language worthy of tasting, as well as a book called "Metaprogramming Ruby